Acoustic method of connecting boreholes for multi-lateral comple

Details Acoustic method of connecting boreholes for multi-lateral comple Acoustic method of connecting boreholes for multi-lateral comple

1997-09-30

2000-02-22

Neuder, William

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

E21B 4702

Patent

active

060269138

ABSTRACT:
The invention is a device and related method of finding from at least one receiver the location of a source of a transmitted acoustic signal. Both signal source and signal receiver are downhole. The invention uses either or both the triangulation method and the holographic method to determine signal location.
The triangulation technique uses the relationships existing in Pythagorean's theorem to find source location. In contrast, the holographic technique uses a known velocity structure to assign propagation velocities to volume cells surrounding the receiver. By variational calculus, a ray path and start time may be assigned to a hypothetical source location for a particular receiver position. This is repeated for each receiver position. Where the hypothetical source locations and start times match for multiple receiver locations, the likely position of a source has been found.

REFERENCES:
patent: 3876016 (1975-04-01), Stinson
patent: 4016942 (1977-04-01), Wallis, Jr. et al.
patent: 4458767 (1984-07-01), Hoehn, Jr.
patent: 5258755 (1993-11-01), Kuckes
patent: 5467832 (1995-11-01), Orban et al.
patent: 5589775 (1996-12-01), Kuckes

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